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Old 10-27-2007, 01:48 PM   #1
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Question Failed Smog - Please advise

Hi Guys,
Have not been around for ever, but I had a call from a friend that has failed his Smog here in CA, but only on the 15mph test.
Set up is stock Greddy, no IC, with Bipes. All else is stock kit.

The failure was for the NO (I think looking at the chart) PPM should be 847 Max and the reading was 1138. See attched file - Huh what happened to attachments?

%CO2 %02 HC (PPM) CO (%) NO (PPM)
Test RPM MEAS MEAS MAX AVE MEAS MAX AVE MEAS MAX AVE MEAS RESULTS
15 MPH 1937 15.1 0.2 134 31 84 0.82 0.1 0.22 847 237 1138 FAIL
25 MPH 2273 1501 0.1 108 20 43 0.71 0.09 0.09 786 199 773 PASS


Does anyone have any ideas? I cannot think why it would only fail on this part of the test? At 15MPH for 1937 the turbo is not even working so must be something else.
Timing belt is new and timing checked as good. New air filter, good plugs.

Thanks,

Last edited by bartsimpson; 10-27-2007 at 10:15 PM.
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Old 10-27-2007, 02:03 PM   #2
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i can't desipher your chart, but if everything passed except for a slightly high reading on CO at 15 mph, you should be ok.

what plugs are in the car? what are they gapped to?
good plug wires?
where's the timing?
i assume that the o2 sensor is good because everything else passed fine.

high CO indicates incomplete combustion.
most likely, you need to increase the plug gap to factory spec (.045 I think), and pull base timing back to 6 or so. The timing will be bad for performance, but will allow the mixture more time to burn.
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Old 10-27-2007, 02:31 PM   #3
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wait ... doesnt pulling timing decrease NO while advancing timing decreases CO? More advance would allow more time for it all to burn I would think.
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Old 10-27-2007, 03:55 PM   #4
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Old 10-27-2007, 05:22 PM   #5
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I could not attach the chart, but yes everything is fine except the NO reading at 15mph of 1138 instead of 847 Max.

I will have the plugs checked for gap. I know the plug wires are good as they were installed last year NGK blue (and the car has been off the road for half a year). I was told the timing was ok, but have to check the degrees.

As far as the timing is concerned he has the Bipes so no need to retard back to 6 degrees. Bipes will pull timing when needed. Do you think the Bipes settings could be an issue?


Quote:
Originally Posted by Ben View Post
i can't desipher your chart, but if everything passed except for a slightly high reading on CO at 15 mph, you should be ok.

what plugs are in the car? what are they gapped to?
good plug wires?
where's the timing?
i assume that the o2 sensor is good because everything else passed fine.

high CO indicates incomplete combustion.
most likely, you need to increase the plug gap to factory spec (.045 I think), and pull base timing back to 6 or so. The timing will be bad for performance, but will allow the mixture more time to burn.

Last edited by bartsimpson; 10-27-2007 at 10:16 PM.
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Old 10-27-2007, 07:16 PM   #6
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How do the plugs look? Sooty? I had slightly higher NO readings and hte dude said it could be attributed to a minor oil burn issue. Which wouldn't surprise me considering I turboed the engine at 151k miles.
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Old 10-27-2007, 08:20 PM   #7
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Default Same problem -

I had the same problem recently - what I did to pass the test.

1. replaced my 1.8 injectors with stock 1.6
2. lowered my timing down to 7degree
3. lower my fuel pressure regulator to less than stock
4. C0 was so low - passed the test.
5. revert changes.

I hope this help.
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Old 10-27-2007, 10:10 PM   #8
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Ok forgot to mention, this is a 1.6 so injectors are stock. FPR is the Vortec so its fixed (per stock).

I'll have him check the plug look.

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Originally Posted by tuyvux View Post
I had the same problem recently - what I did to pass the test.

1. replaced my 1.8 injectors with stock 1.6
2. lowered my timing down to 7degree
3. lower my fuel pressure regulator to less than stock
4. C0 was so low - passed the test.
5. revert changes.

I hope this help.
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Old 10-27-2007, 10:11 PM   #9
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BTW does anyone think the Bipes can cause this? No mention of that here?

Sorry also AMENDED all the posts its the NO that was high.

Thanks for all the comments
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Old 10-29-2007, 02:20 PM   #10
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Nitrous oxide?

Catalytic converter.

If the timing is advanced, retard it to stock 10 degrees.
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Old 10-29-2007, 02:26 PM   #11
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cat +1
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Old 10-29-2007, 08:25 PM   #12
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I failed my smog check in Texas. A new cat - passed smogged with flying colors.
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Old 11-03-2007, 03:07 AM   #13
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take out the turbo pass the test then put it back on :]
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Old 11-06-2007, 12:54 PM   #14
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Protip: NEVER, EVER put "Please advise" in your ebay emails unless you want them to be ignored. In fact it's a good practice to delete "please advise" from your vocabulary altogether.
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Old 11-06-2007, 01:12 PM   #15
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Quote:
Originally Posted by StankCheeze View Post
Protip: NEVER, EVER put "Please advise" in your ebay emails unless you want them to be ignored. In fact it's a good practice to delete "please advise" from your vocabulary altogether.
WTF is this ebay no he is a vetran member asking us for help not a random newb on faceless ebay. Come on dude.
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Old 11-13-2007, 06:00 PM   #16
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Quote:
Originally Posted by bartsimpson View Post
BTW does anyone think the Bipes can cause this? No mention of that here?

Sorry also AMENDED all the posts its the NO that was high.

Thanks for all the comments
No, I have Bipes on my ride right now and it passed just so.
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Old 11-23-2007, 01:51 AM   #17
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Thanks issue closed. The guy got it to *pass*
Cheers all.
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Old 11-23-2007, 01:54 AM   #18
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Quote:
Originally Posted by StankCheeze View Post
Protip: NEVER, EVER put "Please advise" in your ebay emails unless you want them to be ignored. In fact it's a good practice to delete "please advise" from your vocabulary altogether.
Protip: Remember what site your on before posting.
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Old 11-30-2007, 01:43 AM   #19
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speaking of passing, I just passed my car today and the numbers were so low I was amazed. However I a new cat and a rebuilt motor w/ mild porting at 5k miles with 180psi compression probably helps. I also gapped my plugs to .50 and of course went back to stock ecu and injectors.

I got less then the average on every single test and most tests I was about half of the average.
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Old 11-30-2007, 04:46 AM   #20
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just for future reference can you please post what your resolution was?
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